20435248821 has 8 divisors (see below), whose sum is σ = 29342921440. Its totient is φ = 12575537712.

The previous prime is 20435248781. The next prime is 20435248891. The reversal of 20435248821 is 12884253402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20435248821 - 2²⁹ = 19898377909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 523980739 = 20435248821 / (2 + 0 + 4 + 3 + 5 + 2 + 4 + 8 + 8 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20435248821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20435248891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261990331 + ... + 261990408.

It is an arithmetic number, because the mean of its divisors is an integer number (3667865180).

Almost surely, 2^20435248821 is an apocalyptic number.

It is an amenable number.

20435248821 is a deficient number, since it is larger than the sum of its proper divisors (8907672619).

20435248821 is a wasteful number, since it uses less digits than its factorization.

20435248821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523980755.

The product of its (nonzero) digits is 122880, while the sum is 39.

The spelling of 20435248821 in words is "twenty billion, four hundred thirty-five million, two hundred forty-eight thousand, eight hundred twenty-one".